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Role of Expert Testimony in Drunk Driving Cases

When an individual has been charged with drunk driving, the State will often present expert testimony concerning chemical tests. The State is required to provide a proper foundation for chemical tests. However, if the defense can show that the State's expert lacked the required qualifications or that another key component of a proper foundation for admissibility is missing, the defense can object to the admission of the chemical tests. Although courts may allow an expert to testify regarding the results of tests done by a lab technician under the expert's direct supervision, the evidence can be excluded if the defense can show that the expert witness had no knowledge about the details of the chemical analysis other than what the technician reported.

Chemical Test Presumptions in Drunk Driving Cases

If you have ever been arrested for drunk driving you were probably given some sort of chemical test to determine your blood alcohol content. The most common chemical tests include a breath test or blood test. Many jurisdictions have statutes that allow prosecutors to give presumptive effect to chemical test readings of blood-alcohol content. In other words, if a person's blood alcohol content is at a certain level, the court will presume automatically that the person was driving under the influence of alcohol. Depending on the jurisdiction, some statutes will use the word "presumption," while others use the term "prima facie evidence."

Double Jeopardy Defense in DWI/DUI Cases

Drunk driving defendants have challenged the constitutionality of the states' dual use of administrative license suspension (ALS) statutes and criminal driving while intoxicated (DWI) prosecutions with the so-called Double Jeopardy Drunk Driving defense.

Criminal Offense of Driving at an Excessive Rate of Speed

A speeding offense constitutes the operation of a motor vehicle at a speed in excess of that permitted under the state statutes, local ordinances, or highway or traffic commission regulations. The typical speed statute prohibits driving in excess of a specified number of miles per hour. In addition to setting forth the specified maximum rate of speed, the speed statutes usually contain provisions prohibiting driving at a speed greater than is ''reasonable and proper'' or ''reasonable and prudent'' under the prevailing conditions or having regard to the actual and potential hazards then existing, or words of similar import.

Penalties for Criminal Offense of Driving While Impaired

The penalties for driving while impaired tend to be less harsh than the penalties for driving while under the influence or driving while intoxicated. The penalties for driving while impaired do vary depending upon the state. In most cases the offense for a first time offender is considered a misdemeanor.